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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b39865326fd2211f7a5b07ef9c4ef0c272339af79df0f0b6ae032f50e84b33f1' 
  AND token = 'r82EdBoU4U6q1HUaOD2g+ZmdQMCSQvgchhuM2avKX2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}